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New Insights into the Plateau-Insulator Transition in the Quantum Hall Regime | | L.A. Ponomarenko
; D.T.N. de Lang
; A. de Visser
; D. Maude
; B.N. Zvonkov
; R.A. Lunin
; A.M.M. Pruisken
; | | Date: |
19 Aug 2003 | | Journal: | Physica E 22 (2004) 236 | | Subject: | Mesoscopic Systems and Quantum Hall Effect | cond-mat.mes-hall | | Abstract: | We have measured the quantum critical behavior of the plateau-insulator (PI) transition in a low-mobility InGaAs/GaAs quantum well. The longitudinal resistivity measured for two different values of the electron density follows an exponential law, from which we extract critical exponents kappa = 0.54 and 0.58, in good agreement with the value (kappa = 0.57) previously obtained for an InGaAs/InP heterostructure. This provides evidence for a non-Fermi liquid critical exponent. By reversing the direction of the magnetic field we find that the averaged Hall resistance remains quantized at the plateau value h/e^2 through the PI transition. From the deviations of the Hall resistance from the quantized value, we obtain the corrections to scaling. | | Source: | arXiv, cond-mat/0308371 | | Services: | Forum | Review | PDF | Favorites | |
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